thnks for the replies guys. we tried netsend.. but found out that everything is actually logged in your event logs. so... prefer it not to be
i'll try out the other stuff a friend of mine introduced me to borg chat, anyone tried that?

i just tried Achat, very nice interface i like it. but i can't get it to work. Me and my colls are on diff subnet mask. but can't seem to see each other. do you have to manually add every single user? or do some other setup? also, is the multicast working? it says it's experimental but i'm not sure if it's working.

EZIM is a messenger for internal communication. It does not need a server to authenticate against to sign in. As long as you can get an IP address from the DHCP server (i.e. the network supports multicast), it will be able to find all other users within the same network segment and communicate with them. It is very handy to use on local area networks as it allows admins to provide a simple messenger service to the members without the need to add more servers, making life alot easier.

EZIM works on Windows, Linux, Mac OS X and other operating systems which has Java Runtime Environment Version 6 or above installed.

It also contains a useful option which is to broadcast to all users as well as the standard private instant message.

I used Winpopup way back in the day, well 1998 I think, worked awesome.
Apparently it was based on what was included already with Win 95/98, but redone with more functionality.http://www.winpopup-lan-messenger.com/